Our water is the most precious resource and we can't afford to waste it. Some of the easiest ways to keep the water supply safe include not pouring out thinners, solvents or paint down the drain. You can have them picked up or delivered to a hazardous waste disposal site. Maybe you have a local theater group, school, or parks department that can use your leftovers. Or you can donate it to a local paint contractor or local furniture refinishing.